Possible relics of the ancient Roman city are hidden in this restaurant's façade.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

One of the only single-person private gravesites in New York City.

One of the oldest Jewish cemeteries in the city, it is now overgrown with an urban forest.

A mysterious statue of a leather jacket-clad rebel leans coolly on an odd yellow clock.

Unique antiquarian shop specializing in globes, maps, and prints.

New York's oldest and possibly grandest keeper of books.

The front yard of an Upper East Side town house hides the last fragment of one of New York's most famous theatres.

Collect holy water from a Bronx grotto.

This elaborate towering structure was once famed for its revolutionary height.

This half-forgotten fortress was constructed by the Ottoman conqueror of Constantinople.

Flames have been burning within this mountain for more than 2,500 years.

Roman ruins, natural methane fires and a lovely beach.

Turkish adventurer antiques in the heart of the Grand Bazaar.

Once described as the "Eagle's Nest," this ruined ancient city rests on a remote mountaintop.

A Lycian city of the dead carved into the hillside of Southern Turkey, complete with startlingly human touches.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

A tiny Greek Orthodox church from the Ottoman era hides on a busy city street.

The only surviving choragic monument is a trophy awarded in 334 BC for the winning dramatic chorus.

This gem is often wrongly overshadowed by the larger, newer Metropolis church in Athens.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

Where commuters walk through remnants of an ancient Greek necropolis.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

An ancient octagonal weather station named for the eight Greek gods of wind.